When installing both the servicing stack update (SSU) (KB4093137) and the latest cumulative update (LCU) from the Microsoft Update Catalog, install the SSU before installing the LCU.
Software Update installation order is sorted based on the Software Update release date (Inv_Software_Update.ReleaseDate).
Patch Management Solution 8.1
Patch Data Import for Windows 7.3.97
As this requirement seems to be a one off occurrence, we recommend disabling the April 2018 Cumulative Update bulletin and distributing the May 2018 Cumulative update instead.
This ensures the SSU update is installed before the May 2018 cumulative update.